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baer's pochard duck at risk of extinction. 202032820116
diversity of wintering waterbirds enhanced by restoring aquatic vegetation at shengjin lake, china.the restoration of planted vegetation contributes towards improving the habitat quality of waterbirds and enhancing the diversity of their communities. thus, the success of projects attempting to restore aquatic vegetation could, in part, be quantified by evaluating the community structure of wintering waterbirds. here, we evaluated the effect of wetland restoration (through planting aquatic vegetation) by comparing waterbird communities in restored versus unrestored areas over two wintering per ...202032783837
bioserotypes, virulence markers, and antimicrobial susceptibility of yersinia enterocolitica strains isolated from free-living birds.the risk of meat contamination with yersinia enterocolitica poses a threat to consumers and persons who come into contact with bird carcasses. the occurrence of y. enterocolitica in the vast majority of migratory game species, the capercaillie, and the black grouse has never been studied in poland, europe, or in the world. the material for the study consisted of cloacal swabs obtained from 143 eurasian coots, 50 mallards, 30 pochards, 27 greylag geese, 22 white-fronted geese, 22 bean geese, 20 g ...202032258154
meteorological factors affecting the risk of transmission of hpai in miyazaki, japan.highly pathogenic avian influenza (hpai) outbreaks engender a severe economic impact on the poultry industry and public health. migratory waterfowl are considered the natural hosts of hpai virus, and hpai viruses are known to be transmitted over long distances during seasonal bird migration. bird migration is greatly affected by the weather. many studies have shown the relationship between either autumn or spring bird migration and climate. however, few studies have shown the relationship betwee ...201931565229
pcb residues in the tissues of sea ducks wintering on the south coast of the baltic sea, poland.the baltic sea is known to be severely polluted by a range of chemicals, one group of which being pcbs. although the use and production of pcbs were limited or banned in many countries in the 1970s, their presence is still observed in the environment. the aim of this study was to evaluate pcbs concentration in four species of diving sea ducks, interspecies and tissues differences, and in the case of game species, comparison of the obtained results with maximal residue levels (mrls) and tolerable ...201930796664
waterbird counts on large water bodies: comparing ground and aerial methods during different ice conditions.the aerial and ground methods of counting birds in a coastal area during different ice conditions were compared. ice coverage of water was an important factor affecting the results of the two methods. when the water was ice-free, more birds were counted from the ground, whereas during ice conditions, higher numbers were obtained from the air. the first group of waterbirds with the smallest difference between the two methods (average 6%) contained seven species: mute swan cygnus olor, whooper swa ...201830038859
wild ducks excrete highly pathogenic avian influenza virus h5n8 (2014-2015) without clinical or pathological evidence of disease.highly pathogenic avian influenza (hpai) is essentially a poultry disease. wild birds have traditionally not been involved in its spread, but the epidemiology of hpai has changed in recent years. after its emergence in southeastern asia in 1996, h5 hpai virus of the goose/guangdong lineage has evolved into several sub-lineages, some of which have spread over thousands of kilometers via long-distance migration of wild waterbirds. in order to determine whether the virus is adapting to wild waterbi ...201829670093
a genomic perspective of the pink-headed duck rhodonessa caryophyllacea suggests a long history of low effective population size.the first molecular phylogenetic hypothesis for the possibly extinct pink-headed duck rhodonessa caryophyllacea unambiguously shows that it belongs to the pochard radiation that also includes the genera aythya and netta. it is the sister to all modern-day pochards and belongs to a lineage that branched off from the others more than 2.8 million years ago. rhodonessa caryophyllacea is believed to never have been common in modern time and we show this has probably been the situation for as long as ...201729203781
ducks change wintering patterns due to changing climate in the important wintering waters of the odra river estuary.some species of birds react to climate change by reducing the distance they travel during migration. the odra river estuary in the baltic sea is important for wintering waterfowl and is where we investigated how waterbirds respond to freezing surface waters. the most abundant birds here comprise two ecological groups: bottom-feeders and piscivores. numbers of all bottom-feeders, but not piscivores, were negatively correlated with the presence of ice. with ongoing global warming, this area is inc ...201728785517
pathogenesis and phylogenetic analyses of two avian influenza h7n1 viruses isolated from wild birds.the emergence of human infections with a novel h7n9 influenza strain has raised global concerns about a potential human pandemic. to further understand the character of other influenza viruses of the h7 subtype, we selected two h7n1 avian influenza viruses (aivs) isolated from wild birds during routine surveillance in china: a/baer's pochard/hunan/414/2010 (bp/hun/414/10) (h7n1) and a/common pochard/xianghai/420/2010 (cp/xh/420/10) (h7n1). to better understand the molecular characteristics of th ...201627458455
effects of invasive fish and quality of water and sediment on macrophytes biomass, and their consequences for the waterbird community of a mediterranean floodplain.floodplains are among the most threatened ecosystems world-wide because of multiple stressors, i.e., invasive species, pollution and aquifer overexploitation; the tablas de daimiel national park (spain) is a clear example of these kinds of impact. this work aims to test whether invasive fish and/or the water and sediment quality are significant drivers of the decline of stonewort (chara spp.) meadows in the tablas de daimiel, investigating how this could explain changes observed in the waterbird ...201626896580
trace element concentrations in feathers of five anseriformes in the south of the caspian sea, iran.birds are susceptible to environmental changes, which make them particularly important as indicators of environmental contamination, including metal concentrations. in the present study, the concentrations of arsenic (as), cadmium (cd), chromium (cr), iron (fe), lead (pb), manganese (mn), nickel (ni), and zinc (zn) in the tail and flight feathers of greylag goose, mallard, pintail, pochard, and wigeon were investigated from the south of the caspian sea in iran by the electrothermal atomic absorp ...201626661958
highly pathogenic avian influenza a(h5n1) virus struck migratory birds in china in 2015.approximately 100 migratory birds, including whooper swans and pochards, were found dead in the sanmenxia reservoir area of china during january 2015. the causative agent behind this outbreak was identified as h5n1 highly pathogenic avian influenza virus (hpaiv). genetic and phylogenetic analyses revealed that this sanmenxia h5n1 virus was a novel reassortant, possessing a clade 2.3.2.1c ha gene and a h9n2-derived pb2 gene. sanmenxia clade 2.3.2.1c-like h5n1 viruses possess the closest genetic i ...201526259704
complete genome sequence of avian paramyxovirus strain apmv-6/red-crested pochard/balkhash/5842/2013 from kazakhstan.an avian paramyxovirus 6 strain was isolated during a wild bird monitoring study in kazakhstan in 2013. the virus was isolated from a wild duck red-crested pochard (netta rufina) in southeastern kazakhstan. here, we present the complete genome sequence of the virus.201526184926
study on metal concentrations in tissues of mallard and pochard from two major wintering sites in southeastern caspian sea, iran.we examined concentrations of cadmium, chromium, iron, lead and zinc in the kidney, liver, and pectoral muscle of mallards (anas platyrhynchos; n = 30) and pochards (aythya ferina; n = 30) from two important wintering sites in the southeastern caspian sea in the winter of 2012. mean lead concentrations (µg g(-1) ww) in livers (2.36 ± 1.00) of pochard and in kidneys (3.43 ± 0.91) of mallard exceeded the exposure threshold levels in liver (1.5 µg g(-1) ww) and kidney (3 µg g(-1) ww) of waterfowl. ...201526141923
integrative taxonomy of central european parasitic flatworms of the family prosthogonimidae lühe, 1909 (trematoda: plagiorchiida).species of the family prosthogonimidae are considered the most pathogenic poultry trematodes worldwide, affecting particularly low intensity farming in rural areas. adults of prosthogonimus occur mainly in the bursa of fabricius, oviduct and cloaca of ducks, geese, fowl and other birds feeding at least occasionally on dragonflies or damselflies (odonata). we analyzed the central european species of the prosthogonimidae, namely prosthogonimus cuneatus, prosthogonimus ovatus, prosthogonimus pelluc ...201525724855
the complete mitochondrial genome of aythya ferina (anatidae: aythya).the mitochondrial genome of aythya ferina (anatidae: aythya) is a circular molecule of 16,616 bp in length, containing 13 protein-coding genes, 2 ribosomal rna genes, 22 transfer rna genes and one control region (d-loop). overall base composition of the complete mitochondrial dna was 29.42% a, 22.19% t, 32.83% c and 15.56% g. all the genes in a. ferina were distributed on the h-strand, except for the nd6 subunit gene and eight trna genes which were encoded on the l-strand.201624938097
movement patterns in a partial migrant: a multi-event capture-recapture approach.partial migration is a pervasive albeit poorly studied phenomenon by which some individuals of a population migrate while others are residents. it has tremendous consequences on seasonal variations of population size/structure and therefore management. using a multi-event capture-mark-recapture/recovery (cmr) approach, we assessed seasonal site occupancy, survival and site fidelity of a partially migratory diving duck, the common pochard (aythya ferina), in an area potentially including both loc ...201424802936
the origin of novel avian influenza a (h7n9) and mutation dynamics for its human-to-human transmissible capacity.in february 2013, h7n9 (a/h7n9/2013_china), a novel avian influenza virus, broke out in eastern china and caused human death. it is a global priority to discover its origin and the point in time at which it will become transmittable between humans. we present here an interdisciplinary method to track the origin of h7n9 virus in china and to establish an evolutionary dynamics model for its human-to-human transmission via mutations. after comparing influenza viruses from china since 1983, we estab ...201424671138
lead gunshot pellet ingestion and tissue lead levels in wild ducks from argentine hunting hotspots.lead poisoning in waterfowl due to ingestion of lead pellets is a long recognized worldwide problem but poorly studied in south america, particularly in argentinean wetlands where duck hunting with lead gunshot is extensive. in 2008, we found high pellet ingestion rates in a small sample of hunted ducks. to expand our knowledge on the extent of lead exposure and to assess health risks from spent shot intake, during 2011 and 2012 we sampled 415 hunter-killed ducks and 96 live-trapped ducks. we de ...201424314629
intra-guild interactions and projected impact of climate and land use changes on north american pochard ducks.the co-occurrence of functionally similar species is very common in nature, and is often put forward as a basis for ecosystem resilience to disturbance. at the same time, competition between similar species is also considered a strong driver of community composition. however, environmental stochasticity can alter this prediction, either because competitive abilities depend on time-varying factors or because covariance in species' responses to environmental conditions masks the effect of competit ...201323322386
isolation and characterization of an h9n2 influenza virus isolated in argentina.as part of our ongoing efforts on animal influenza surveillance in argentina, an h9n2 virus was isolated from a wild aquatic bird (netta peposaca), a/rosy-billed pochard/argentina/cip051-559/2007 (h9n2) - herein referred to as 559/h9n2. due to the important role that h9n2 viruses play in the ecology of influenza in nature, the 559/h9n2 isolate was characterized molecularly and biologically. phylogenetic analysis of the ha gene revealed that the 559/h9n2 virus maintained an independent evolutiona ...201222709552
range-wide genetic population structure of common pochard (aythya ferina): a potentially important vector of highly pathogenic avian influenza viruses.an understanding of the distribution and spatial structure of the natural vectors of zoonothic pathogens is of interest for effective disease control and prevention. here, we investigate the range-wide population genetic structure of common pochard (aythya ferina), a long-distance migratory duck and potential vector of highly pathogenic avian influenza. we collected several hundred samples from breeding and wintering grounds across eurasia including some h5n1-positive individuals and generated p ...201122393520
multiple endocardial neurofibromas in a rosy-billed pochard (netta peposaca).endocardial neoplasms are uncommon in veterinary species with most cases restricted to endocardial schwannomas in aged rats. a 15-year-old male rosy-billed pochard (netta peposaca) was diagnosed following necropsy with numerous, proliferative endocardial masses. histologically, these masses were composed of interlacing streams and bundles of neoplastic spindle cells supported by a fine fibrovascular stroma. rare areas of cellular and nuclear palisading were present in the nodules. approximately ...201222362538
Phylogenetic Analysis of H6 Influenza Viruses Isolated from Rosy-Billed Pochards (Netta peposaca) in Argentina Reveals the Presence of Different HA Gene Clusters.Until recently, influenza A viruses from wild waterfowl in South America were rarely isolated and/or characterized. To explore the ecology of influenza A viruses in this region, a long-term surveillance program was established in 2006 for resident and migratory water birds in Argentina. We report the characterization of 5 avian influenza viruses of the H6 hemagglutinin (HA) subtype isolated from rosy-billed pochards (Netta peposaca). Three of these viruses were paired to an N2 NA subtype, while ...201121976652
cloacotaenia megalops (nitzsch in creplin, 1829) (cestoda, hymenolepididae) in wild ducks in western pomerania, poland.cloacotaenia megalops (nitzsch in creplin, 1892) is a polyxenic and cosmopolitan tapeworm from the family hymenolepididae. its generic name derives from their typical location (cloaca), and the typical final hosts which are birds typically associated with water and marsh environments: anseriformes, galliformes and gruiformes. in poland, the presence of c. megalops has been observed so far in 16 species of ducks from the baltic coast, the mazurian lake district, wielkopolsko-kujawska lowland, maz ...201121682099
effects of lead exposure on oxidative stress biomarkers and plasma biochemistry in waterbirds in the field.medina lagoon in andalusia has one of the highest densities of spent lead (pb) shot in europe. blood samples from waterbirds were collected in 2006-2008 to measure pb concentration (pbb), d-aminolevulinic acid dehydratase (alad), oxidative stress biomarkers and plasma biochemistry. pbb above background levels (>20 µg/dl) was observed in 19% (n=59) of mallards (anas platyrhynchos) and in all common pochards (aythya ferina) (n=4), but common coots (fulica atra) (n=37) and moorhens (gallinula chlor ...201121411076
avifauna in the panipat region, haryana (india).avifaunal study was carried out in the panipat region, haryana (india) at 56 locations. 91 birds species were observed during the study, of which, 39 species were aquatic. house sparrow was found to be dominant followed by bank myna, house crow and indian myna. among the aquatic birds, cattle egret was dominant followed by common pochard, pintail and blackwinged stilt. encounter rates of the birds were related to the dominant indices of each species. species diversity index was found to be 10.25 ...201021114110
surveillance and identification of influenza a viruses in wild aquatic birds in the crimea, ukraine (2006-2008).the ecology of avian influenza (ai) viruses in wild aquatic birds of asia is poorly understood, especially for the h5n1 high pathogenicity ai (hpai) viruses. from march 2006 through november 2008, 20 ai viruses were isolated in the crimea region of ukraine with an overall frequency of virus recovery of 3.3%. all the viruses were isolated from three species of dabbling ducks: mallard (anas platyrhynchos), wigeon (anas penelope), and garganey (anas querquedula), making the frequency of virus recov ...201020945793
epidemiology of avian influenza virus in wild birds in switzerland between 2006 and 2009.after the spread of h5n1 highly pathogenic avian influenza virus (aiv) from asia into russia, the middle east, europe, and africa in 2005-06, the swiss national aiv surveillance program was extended. one of the new focal points was lake constance, where sentinel duck stations and swim-in traps were established within the project constanze in collaboration with germany and austria. more than 2000 samples from 41 species were collected in switzerland between september 2006 and december 2008. appro ...201020608533
final hosts and variability of trichobilharzia regenti under natural conditions.in europe, despite of intensive work on avian schistosomes in the past, only one representative of nasal schistosomes has been detected so far, trichobilharzia regenti, a species that remained undescribed to the scientific community until 1998. since then, however, t. regenti has gained a considerable attention, not only due to the induction of serious lesions concomitant with the migration of the schistosomulae through the central nervous system of their natural hosts (birds) but also due to th ...201020556426
presence of serum antibodies to influenza a subtypes h5 and n1 in swans and ibises in french wetlands, irrespective of highly pathogenic h5n1 natural infection.highly pathogenic (hp) avian influenza a viruses (aivs) subtype h5n1 (subclade 2.2) were detected in wild birds during outbreaks in france during winter 2006 and summer 2007 in la dombes wetlands (eastern france) and in moselle wetlands (northeastern france), respectively. blood samples from apparently healthy wild birds were collected in 2006 and 2007 from the end of the outbreak to several weeks after the influenza a outbreak inside and outside the contaminated areas, and in 2008 outside the c ...201020521685
spatial and temporal association of outbreaks of h5n1 influenza virus infection in wild birds with the 0 degrees c isotherm.wild bird movements and aggregations following spells of cold weather may have resulted in the spread of highly pathogenic avian influenza virus (hpaiv) h5n1 in europe during the winter of 2005-2006. waterbirds are constrained in winter to areas where bodies of water remain unfrozen in order to feed. on the one hand, waterbirds may choose to winter as close as possible to their breeding grounds in order to conserve energy for subsequent reproduction, and may be displaced by cold fronts. on the o ...201020386716
avian influenza virus monitoring in wintering waterbirds in iran, 2003-2007.virological, molecular and serological studies were carried out to determine the status of infections with avian influenza viruses (aiv) in different species of wild waterbirds in iran during 2003-2007. samples were collected from 1146 birds representing 45 different species with the majority of samples originating from ducks, coots and shorebirds. samples originated from 6 different provinces representative for the 15 most important wintering sites of migratory waterbirds in iran.201020167132
the potential distance of highly pathogenic avian influenza virus dispersal by mallard, common teal and eurasian pochard.waterbirds represent the major natural reservoir for low pathogenic (lp) avian influenza viruses (aiv). among the wide diversity of subtypes that have been described, two of them (h5 and h7) may become highly pathogenic (hp) after their introduction into domestic bird populations and cause severe outbreaks, as is the case for hp h5n1 in south-eastern asia. recent experimental studies demonstrated that hp h5n1 aiv infection in ducks does not necessarily have significant pathological effects. thes ...201020112048
characterization of low pathogenicity avian influenza viruses isolated from wild birds in mongolia 2005 through 2007.since the emergence of h5n1 high pathogenicity (hp) avian influenza virus (aiv) in asia, numerous efforts worldwide have focused on elucidating the relative roles of wild birds and domestic poultry movement in virus dissemination. in accordance with this a surveillance program for aiv in wild birds was conducted in mongolia from 2005-2007. an important feature of mongolia is that there is little domestic poultry production in the country, therefore aiv detection in wild birds would not likely be ...200919891786
recent and chronic exposure of wild ducks to lead in human-modified wetlands in santa fe province, argentina.poisoning of waterfowl due to ingestion of lead pellets is a worldwide problem in areas that are subject to hunting. no studies have assessed exposure of waterbirds to this heavy metal in argentina, in spite of intense hunting activity, and the fact that only lead ammunition is commercially available. the objective of this study was to evaluate duck exposure to lead by examining gizzard and bone samples collected from 30 wild ducks, 16 rosy-billed pochard (netta peposaca), and 14 fulvous whistli ...200919617495
the epidemiology of the highly pathogenic h5n1 avian influenza in mute swan (cygnus olor) and other anatidae in the dombes region (france), 2006.in february 2006, a highly pathogenic avian influenza (hpai) h5n1 virus was isolated from common pochards (aythia ferina) in the dombes region of france, an important migrating and wintering waterfowl area. thereafter, hpai h5n1 virus was isolated from 39 swab pools collected from dead waterfowl found in the dombes, but only from three pooled samples collected outside of this area but located on the same migration flyway. a single turkey farm was infected in the dombes. the epizootic lasted 2 mo ...200818957637
avian influenza in wild waterfowl and shorebirds in the donana national park: serological survey using the enzyme-linked immunosorbent assay.the indirect elisa was used to detect antibodies to influenzavirus a in the sera of wildfowl from the donana national park. of the 712 birds examined, 44 (6.2%) were seropositive. positive birds belonged to 10 of the 13 species studied. infection rates varied widely: spoonbill (platalea leucorodia, 32.2%), mallard (anas platyrhynchos, 9.9%), gadwall (anas strepera, 8.6%), red-crested pochard (netta rufina, 8.1%), pochard (aythya ferina, 6.4%), shoveler (anas clypeata, 5%), great crested grebe (p ...199418671098
wild ducks as long-distance vectors of highly pathogenic avian influenza virus (h5n1).wild birds have been implicated in the expansion of highly pathogenic avian influenza virus (h5n1) outbreaks across asia, the middle east, europe, and africa (in addition to traditional transmission by infected poultry, contaminated equipment, and people). such a role would require wild birds to excrete virus in the absence of debilitating disease. by experimentally infecting wild ducks, we found that tufted ducks, eurasian pochards, and mallards excreted significantly more virus than common tea ...200818394278
double introduction of highly pathogenic h5n1 avian influenza virus into france in early 2006.highly pathogenic avian influenza (hpai) viruses of subtype h5n1 have spread since late 2003 in east and southeast asia. in april 2005, a large-scale outbreak of h5n1 infection that occurred in migratory waterfowl in qinghai lake nature reserve in western china, killing more than 6000 wild birds, appeared to be the beginning of a epizootic that caused outbreaks in domestic and wild birds in nearly 60 countries from central asia, the middle east, europe and africa. the first case of asian lineage ...200818202945
trace metal concentrations are higher in cartilage than in bones of scaup and pochard wintering in poland.bones and cartilage of two species of diving ducks: the scaup aythya marila (n=24) and the pochard a. ferina (n=24) were studied. scaup is protected in poland where it spends only the winter, while pochard is a game bird, abundant and breeding in poland. in winter, the two species form large flocks off the southern coast of the baltic, particularly in the szczecin lagoon where they were collected for this study. the bones and cartilage (trachea) were assayed for concentrations (dry weight-based) ...200717854863
determination of definitive and intermediate hosts of cercarial dermatitis-producing agents in northern iran.the study concerns the prevalence of avian schistosomes in intermediate and definite hosts in mazandaran province, northern iran.200616649371
after the aznalcóllar mine spill: arsenic, zinc, selenium, lead and copper levels in the livers and bones of five waterfowl species.in april 1998, a holding lagoon containing pyrite ore processing waste, failed and released 5-6 million m3 of highly polluting sludge and acidic water. over 2650 ha of the internationally important doñana natural park became contaminated, along with < 100 ha of the more pristine doñana national park. in order to assess the affect of the spill on waterfowl from doñana, bone and liver samples from 124 individuals have been analysed for as, pb, cu, zn and se. five species have been studied, from th ...200616165123
[distribution of trematodes of the family prosthogonimidae in river and lake ecological systems in the south of the western siberia].the results of long-term investigations (1994-2003) of an infection rate of trematodes of the family prosthogonimidae in the first intermediate hosts (snails of the family bithyniidae) and in the final hosts (birds) from a basin of the chany lake (western siberia) are discussed. a total of 1824 specimens of bithynia tentaculata (l., 1758) and 7166 specimens of opisthorchophorus troscheli (paasch, 1842) have been collected from eight rivers and two lakes in the south of the western siberia. data ...200515810558
individual quality, survival variation and patterns of phenotypic selection on body condition and timing of nesting in birds.questions about individual variation in "quality" and fitness are of great interest to evolutionary and population ecologists. such variation can be investigated using either a random effects approach or an approach that relies on identifying observable traits that are themselves correlated with fitness components. we used the latter approach with data from 1,925 individual females of three species of ducks (tufted duck, aythya fuligula; common pochard, aythya ferina; northern shoveler, anas cly ...200515657762
correlates of lifetime reproductive success in three species of european ducks.number of breeding attempts is a strong correlate of lifetime reproductive success (lrs) in birds, but the relative importance of potentially interacting factors affecting lrs has rarely been fully evaluated. we considered simultaneously five main factors hypothesized to influence lrs (age at first breeding, nesting date, number of breeding attempts, female traits, brood parasitism) by analyzing with path analysis 22-year data sets for 1,279 individually marked females and their offspring in tuf ...200415138877
lead shot pellets in the ebro delta, spain: densities in sediments and prevalence of exposure in waterfowl.lead (pb) poisoning has been found to be a serious problem for waterfowl in some southern european countries, but few studies have been conducted in spain. in order to obtain these data, studies were made in the ebro delta, a spanish ramsar site, during 1992 and 1993. lead shot densities in the first 20 cm of sediment ranged from < 8 900 to 2 661 000 shot ha(-1). a similar proportion of birds had lead shot in the gizzard and elevated liver lead (> 5 microg g(-1) dw) concentrations. northern pint ...199715093399
phylogeography of a game species: the red-crested pochard (netta rufina) and consequences for its management.western european populations of red-crested pochard (netta rufina) are characterized by low size and high fragmentation, which accentuate their sensitivity to hunting. uncertainties regarding the demographic trends of these populations highlight the need for pertinent hunting regulations. this requires identification of the limits of the populations under exploitation, i.e. delimiting a management unit. we used the left domain of the mitochondrial control region and seven nuclear loci (four micr ...200415078442
heavy metals in livers of waterbirds from spain.wetlands tend to accumulate heavy metals from local sources, such as pb shot used for waterfowl hunting, and from regional sources, such as atmospheric deposition and riverine or marine inputs. we determined concentrations of six heavy metals (cr, mn, cu, zn, cd, and pb) in livers of waterbirds shot by hunters in five spanish wetlands to study the different factors that can contribute to the accumulation of these metals (sex, age, diet, grit, and pb shot ingestion). differences among wetlands we ...200312712301
a risk model for predicting the effects of lake-side development on wildfowl populations.the lack of quantitative analysis and general scientific rigour in environmental impact assessment (eia) is well documented. while reasons for this may include political and economic factors, the lack of high-level statistical knowledge and skills in environmental consultancies probably contributes to the problem, particularly with regard to ecological studies. this paper develops a simple model for wintering wildfowl populations that predicts different levels of risk from lake-side development. ...200212448408
data set incongruence and correlated character evolution: an example of functional convergence in the hind-limbs of stifftail diving ducks.the unwitting inclusion of convergent characters in phylogenetic estimates poses a serious problem for efforts to recover phylogeny. convergence is not inscrutable, however, particularly when one group of characters tracks phylogeny and another set tracks adaptive history. in such cases, convergent characters may be correlated with one or a few functional anatomical units and readily identifiable by using comparative methods. stifftail ducks (oxyurinae) offer one such opportunity to study correl ...199912066296
high prevalences of lead poisoning in wintering waterfowl in spainsome mediterranean wetlands are found between the areas with the highest prevalence of lead pellet exposure for waterfowl in the world. to assess the situation in spain, availability of pellets in sediments and rates of ingestion by waterfowl were determined in four important wetlands: albufera de valència, el fondo, tablas de daimiel, and doñana (guadalquivir marshes). lead pellet density in sediment was maximum in the albufera, with 2.8 million pellets/ha. in tablas de daimiel, where hunting w ...19989680527
[gymnophallus rebecqui n. sp. (syn. parvatrema sp. 1, j. rebecq, 1964) (digenea: gymnophallidae), an intestinal parasite of ducks from camargue (france)].gymnophallus rebecqui n. sp. replace parvatrema sp. 1 j. rebecq, 1964. metacercariae are described. they occur free in the extrapallial space of cerastoderma glaucum and abra ovata, at the central part of the valves. pallial epithelium hypertrophy is induced by metacercariae and damages are produced at the inner face of the shell of abra ovata. adults have been reared in laboratory hosts (aythya ferina, a. fuligula, anas platyrhynchos, tadorna tadorna and larus argentatus michaellis). natural ad ...19836614742
[distribution of cestodes among domestic ducks and free-living aquatic birds].in 1959-1975, 3404 water birds of 18 species belonging to six orders were examined for the presence of cestodes. the birds came from 52 localities (ponds) in bohemia and moravia where domestic ducks were kept by the state fishery and where also wild water fowl occurred. cestodes of 31 species of the families hymenolepididae, dilepididae, amabiliidae and diploposthidae were found. the total number of examined birds included 2476 domestic ducks (1406 of them, i. e. 56.8%, were positive for cestode ...19836407178
[on the imprinting of instructive action patterns. (studies on mallards anas platyrhynchos l. and red-chested pochard netta rufina pallas)]. 19675628792
sensory innervation of the large limb joints of the european pochard (aythya ferina l.). 19725059723
residues of polychlorinated biphenyls (pcb) and organochlorine insecticides in eggs from mute swan (cygnus olor) and pochard (aythya ferina). 20154629899
[studies on the ontogeny of social behavior patterns and development of calls in the red-crested pochard (netta rufina pallas), with a contribution to the anatomy of the vocal apparatus]. 20154478738
an outbreak of fowl cholera in wild ducks (rosyibilled pochard) in japan. 19863959382
post-chernobyl accident radioactivity measurements in the comunidad autonoma de valencia, spain.increased atmospheric radioactivity after the accident in chernobyl was first detected on air filters. measurements were begun in valencia on may 2, 1986, with the maximum activity being observed around may 3-4, 1986. as a consequence of this accident, annual campaigns of measurements on migrating birds (several species of aquatic birds and song-thrushes) were started. the data corresponding to the campaign immediately after the accident (1986/87) show a generalized contamination (approximately ...19921580397
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